期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.141803
关键词
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资金
- U.S. Department of Energy and National Science Foundation
- Italian Istituto Nazionale di Fisica Nucleare
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Natural Sciences and Engineering Research Council of Canada
- National Science Council of the Republic of China
- Swiss National Science Foundation
- A. P. Sloan Foundation
- Bundesministerium fur Bildung und Forschung, Germany
- World Class University Program
- National Research Foundation of Korea
- Science and Technology Facilities Council
- Royal Society, United Kingdom
- Institut National de Physique Nucleaire et Physique des Particules/CNRS
- Russian Foundation for Basic Research
- Ministerio de Ciencia e Innovacion and Programa Consolider-Ingenio, Spain
- Slovak RD Agency
- Academy of Finland
- STFC [ST/H001077/1, ST/H001026/2, ST/H001026/1, ST/H001069/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [18071002] Funding Source: KAKEN
- ICREA Funding Source: Custom
- Science and Technology Facilities Council [ST/H001026/1, ST/H001026/2, ST/H001069/1, ST/H001077/1, PP/E000444/1] Funding Source: researchfish
We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b') each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from b (b) over bar collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4: 8 fb(-1). We observe events consistent with background expectation, calculate upper limits on the b' pair-production cross section (sigma b (b) over bar less than or similar to 30 fb for m(b') > 375 GeV/c(2)), and exclude m(b') < 372 GeV/c(2) at 95% confidence level assuming a 100% branching ratio of b0 to tW.
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